我正在尝试在 Keras 中创建一个可以接受参数的激活函数beta
像这样:
from keras import backend as K
from keras.utils.generic_utils import get_custom_objects
from keras.layers import Activation
class Swish(Activation):
def __init__(self, activation, beta, **kwargs):
super(Swish, self).__init__(activation, **kwargs)
self.__name__ = 'swish'
self.beta = beta
def swish(x):
return (K.sigmoid(beta*x) * x)
get_custom_objects().update({'swish': Swish(swish, beta=1.)})
它运行良好,无需beta
参数,但是如何在激活定义中包含该参数?我也希望在执行此操作时保存该值model.to_json()
就像 ELU 激活一样。
Update:我根据@today的回答编写了以下代码:
from keras.layers import Layer
from keras import backend as K
class Swish(Layer):
def __init__(self, beta, **kwargs):
super(Swish, self).__init__(**kwargs)
self.beta = K.cast_to_floatx(beta)
self.__name__ = 'swish'
def call(self, inputs):
return K.sigmoid(self.beta * inputs) * inputs
def get_config(self):
config = {'beta': float(self.beta)}
base_config = super(Swish, self).get_config()
return dict(list(base_config.items()) + list(config.items()))
def compute_output_shape(self, input_shape):
return input_shape
from keras.utils.generic_utils import get_custom_objects
get_custom_objects().update({'swish': Swish(beta=1.)})
gnn = keras.models.load_model("Model.h5")
arch = gnn.to_json()
with open(directory + 'architecture.json', 'w') as arch_file:
arch_file.write(arch)
然而,它目前不保存beta
.json 文件中的值。怎样才能让它保值呢?